/ Dictionary / Index R rat-a-tat: Meaning and Definition of Find definitions for: rat-a-tat Pronunciation: (rat'u-tat'), [key] — n. a sound of knocking or rapping: a sharp rat-a-tat on the window. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rat-a-tat (Thesaurus) rataplan ratatouille Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language